Actuators

Logic of naming actuators in VW-group is simple it contains "N" + actuator number. The actuator number is unique. Here you can find fitting location, connectors and some basic information about actuators.

To our mind, actuators information is reference, so there is only simple search by number.

N

Audi R8 42 (2007- )
Audi A8 4E (2002 -)
Audi A6 4F (2005- )
N175_42_87_____1_0906_21_Funktion

Left heat regulation valve -N175

 

A   - Coolant hose

B - Coolant hose

C   - Wire holder

D   - Connector -N175/176

- Heat regulation valves -N175- and -N176 (accessible from underside of vehicle)

F   - Coolant hose

 

The out-flow temperature is regulated by the Climatronic control unit -J255 via the left and right left heat regulation valves -N175/-N176.

The heat regulation valve, left -N175 regulates the coolant flow fed to the associated heat exchanger for the right side of the passenger compartment from the engine cooling circuit. The valve is operated by the Climatronic control unit -J255 by a pulse width modulated voltage signal. Based on the cyclic operation of the control unit in the Climatronic control unit -J255 the coolant flow to the heat exchanger can be matched precisely to the required heating output.

 

Measured value block 042

 

Display zone 1

 

Run-on time of coolant circulation pump -V50- in seconds received from data bus system.

 

Display zone 2

 

Climatronic control unit -J255- calculated

opening time for the heat regulation valve, left -N175 in %.

- The valve is open when under no load (de-energised).

J Readout = "100%" (valve permanently open, e.g. with temperature presetting "Hi" for driver side).

J Readout = "1....99%" (valve is activated in loop control mode)

J Readout = "0%" (valve permanently closed, e.g. with temperature presetting "Lo" for driver side).

 

Display zone 3

 

Climatronic control unit -J255- calculated

opening time for the heat regulation valve, right -N176 in %.

- The valve is open when under no load (de-energised).

J Readout = "100%" (valve permanently open, e.g. with temperature presetting "Hi" for driver side).

J Readout = "1....99%" (valve is activated in loop control mode)

J Readout = "0%" (valve permanently closed, e.g. with temperature presetting "Lo" for driver side).

 

Display zone 4

 

Activation of coolant recirculation pump -V50 by Climatronic control unit

-J255.

J ?Readout = "off" (the pump is not activated, e.g. with temperature presetting "Lo" for driver and passenger side).

J Readout = "on" (pump is activated dependent on ambient temperatures e.g.

at a temperature preset above "Lo" for driver and passenger side)

 

YZNote:

With no current applied the valve is open. If a valve is defective the associated heat exchanger is fully supplied with coolant, so the full heating power output is safeguarded.

A Air conditioner; Rep.Gr. 87; Removing and installing left heat regulation valve -N175 and right heat regulation valve -N176

A Air Conditioner; Repair Group 87; Checking function

A Current flow diagram; ELSA

 




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November 30, 2012
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